The Tissot caliber 2531 is a manual-winding mechanical movement produced during the mid-20th century, specifically in the 1950s and 1960s. It belongs to a generation of movements designed for simple, durable, time-only wristwatches, particularly during the post-war period when Swiss manufacturers like Tissot focused on delivering reliable and accessible watches for everyday use.

This caliber reflects Tissot’s emphasis on mechanical quality, ease of maintenance, and elegant, practical design. While not as widely known as some later Tissot movements, the 2531 remains a robust example of mid-century Swiss horology.

Overview of the Tissot Caliber 2531

The Tissot 2531 was intended for watches with a central hour and minute hand, often accompanied by a small seconds subdial at the 6 o’clock position. It was primarily housed in round or cushion-shaped steel or gold-plated cases, commonly ranging from 33 mm to 36 mm in diameter—well-suited to the dress styles of the era.

Many watches using the 2531 were sold under the Tissot Antimagnetique or Seastar lines, emphasizing durability and reliability, especially for export markets in Europe and North America.

Technical Specifications

• Type: Manual winding

• Functions: Hours, minutes, small seconds

• Jewels: 15

• Frequency: 18,000 vibrations per hour (2.5 Hz)

• Power Reserve: Approximately 40 hours

• Diameter: Around 27 mm (12 lignes)

• Height: ~4 mm

• Shock Protection: Present in later versions (such as Incabloc)

• Finish: Industrial matte with polished elements; blued screws and signed Tissot bridges

Built with a Swiss lever escapement, the 2531 was designed to be serviceable, with a straightforward layout that allowed for effective maintenance over the long term.

Maintenance and Servicing

To ensure accuracy and preserve mechanical condition, the Tissot 2531 should be serviced every 4 to 6 years by a professional watchmaker. Even if the watch appears to run, dried oils and friction can cause damage to pivots, wheels, and the balance.

A standard service includes:

1. Full disassembly of the movement

2. Ultrasonic cleaning of all components

3. Inspection and replacement of worn parts (especially mainspring, balance staff, or crown stem)

4. Lubrication using modern synthetic oils

5. Reassembly and regulation in multiple positions

6. Cleaning and resealing the case (if applicable)

Due to its age, some original parts may be hard to source and might require using donor movements.

Common Wear Areas

• Mainspring fatigue, reducing power reserve

• Balance pivots and jewels, worn from long use or shock

• Small seconds pinion and gear, which run continuously and may wear unevenly

• Crown and stem, which may become worn or loose due to frequent winding

• Keyless works, which can degrade if improperly handled

Despite this, the 2531’s simple construction makes it forgiving and repairable, provided it’s maintained properly.

Usage Tips

• Wind the watch daily, stopping when resistance is felt—do not over-wind

• Avoid moisture and dust—many cases were not designed with modern water resistance

• Keep the watch away from magnets, which can disrupt timekeeping

• Store face-up in a dry environment when not in use to minimize wear on components

Collectibility and Appeal

The Tissot 2531 is not a rare movement, but it has lasting appeal due to:

• Reliable, time-tested construction

• Association with classic Tissot designs

• Affordable entry into vintage Swiss mechanical watches

• Smooth hand-winding and vintage charm

It offers a chance to own a piece of mid-century watchmaking history, ideal for collectors or enthusiasts looking for something understated yet authentic.

Conclusion

The Tissot caliber 2531 is a dependable, straightforward manual movement that powered many of Tissot’s classic watches during the 1950s and 1960s. It combines mechanical simplicity, Swiss precision, and lasting durability, making it a great choice for those who appreciate vintage wristwatches. With proper care, the 2531 continues to offer reliable performance and timeless appeal well into the 21st century.